Triethylamine → 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-cyanomethyl-pyrrolidin-3-yl)-amide

Participants

Reaction Steps

2-(6-Fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (R)-pyrrolidin-3-ylamide from Step 1 was dissolved in dichloromethane with the addition of triethylamine and bromo-acetonitrile. The reaction was concentrated and dried from mixtures of dichloromethane and hexanes. The crude was dissolved in a mixture dichloromethane, tetrahydrofuran, and methanol, supported on silica gel and purified by flash chromatography (4 g silicycle) with 0% to 10% MeOH in dichloromethane (0.5% Et3N). The appropriate fractions were combined and concentrated. The solid obtained was triturated with Et2O and hexanes. The solid was discarded and the mother liquor was concentrated to afford 220 mg (45%) of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-1-cyanomethyl-pyrrolidin-3-yl)-amide as a white solid, 220 mg (45% yield). LC-MS (M+H)+=549.

Provenance & Evidence